GreyKnightsmon

[On Play] ＜De-Digivolve 1＞ 1 of your opponent's Digimon. (Trash the top card. You can't trash past level 3 cards.) Then, all of your opponent's level 4 or lower Digimon can't attack until the end of your opponent's turn.
[All Turns] When this Digimon would be deleted or returned to your hand or deck, you may play 1 [MetalGreymon] and 1 [DarkKnightmon] from this Digimon's digivolution cards without paying the costs.

[Alt]
DigiXros Requirements [DigiXros -2] Blue [MetalGreymon] x [DarkKnightmon]
When this would be played, you may place specified cards from your hand/battle area under it. Each one reduces the play cost.